Amido-oxybenzyl sulfonic acid.



UNTTn STATES Patented May 26, 1903.

PATENT OFFICE.

FRIEDRICH FISCHER AND HUGO GUNTRUM, OF ELBERFELD,GERMANY, ASSIGNORS TOFARBENFABRIKEN OF ELBERFELD 00., OF NEW YORK, N. Y., A CORPORATION OFNEW YORK.

AMlDO-OXYBENZYL SULFONIC ACID.

SPECIFICATION forming part of Letters Patent No. 729,054, dated May 26,1903.

Application filed February 20, 1903. $eria1No. 144,331. (No specimensJTo a whom, it iii/try concern:

Be it known that we, FRIEDRICH FISCHER and HUGO GUNTRUM,chemists,residin g at Elberfeld, Germany, (assignors to the FARBEN-FABRIKEN OFELBERFELD 00., of New York,) have invented a new and usefulImprovement in Amido-Oxybenzyl Sulfonic Acid; and We hereby declare thefollowing to be a clear and exact description of our invention.

We have found that a new amido-oxybenzyl sulfonic acid having theformula org-soar can be obtained by first treatingmeta-nitroortho-oxybenzyl chlorid, having the formula CIII Cl we I l onoccasionally stirring it from time to time. It is filtered, the filteredliquid is acidulated by means of hydrochloric acid, and the sodium saltof meta-nitro-ortho-oxybenzyl sulfonic acid is precipitated by theaddition of common salt. A solution of ten parts of the sodium salt thusproduced in twenty parts of water is then boiled with fifteen parts ofzincdust until the liquid is decolored. It is filtered, and from thefiltered solution the new sulfonic acid is precipitated by the additionof hydrochloric acid.

The new body represents, when dry and pulverized, a whitish powderstable in contact with the air, soluble with difficulty in cold andsoluble in hot water. It is practicallyinsoluble in ether, alcohol, andacetone and forms salts with alkalies.

The process proceeds in an analogous manner if instead of zinc-dustanother reducing agent be employed.

Having now described our invention and in what manner the same is to beperformed, what we claim as new, and desire to secure by Letters Patent,is.

The herein-described new meta-amido-ortho-oxybenzyl sulfonic acid havingthe abovegiven formula which represents in a free state a whitishpowder, stable in contact with the air, soluble with difficulty in coldand soluble in hot water; being practically insoluble in alcohol etherand acetone and forming salts with alkalies, substantially ashereinbefore described.

In testimony whereof we have signed our names in the presence of twosubscribing witnesses.

FRIEDRICH FISCHER. HUGO GUNTRUM. Witnesses:

OTTO KiiNIG, J. A. RITrERsHAUs.

